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I don't know that they want higher oil temperatures than anything else. With the oil cooler, I did find my oil temperatures weren't getting high enough to drive out the moisture on the cooler spring and fall drives. So, that's why I put in a thermostat. It also helps the oil warm up more quickly so I can play harder with it sooner.

I ordered my SPA oil temp/pressure gauge from King Motorsports in Wisconsin (use the Google).

As to optimal oil temp being 213, that doesn't seem peculiar to Zetecs. As far as my very limited research shows, every engine works best if oil is a bit above 212 F since that is the boiling point of water. Hence any water that has adhered/accumulated in the oil system is then burned off. Ditto other realted oil pollutants. I will count on folks with actual knowledge to correct me here if warranted.

Further thoughts: my Caterham's water temps run anywhere from 1/2 way to 3/4's up the gauge. If my oil were super hot, one would think the water would be too. Also, I have a 2 quart Accusump. That means I have a spare 2 quarts of oil sitting in a tank cooling off for 1/2-3/4's of every track lap. It is mounted high on the bulkhead on the passenger side where the seat back would be (if I had a passenger seat). So its in the cool airflow. It comprises 33% of the engine's total oil capacity (roughly 4 qt +2 system) and is cooling much of the time, then getting injected into the hotter engine oil in corners, then back out. All of which suggests that the oil pressure drop is not due to heat. We shall see what the new gauges say.

I am confused, unless you oil is getting so hot it's viscosity is going close to zero, I have no idea why an oil cooler will help your problem. You might show a little increase in oil pressure, but that will be from the extra effort to push the oil thru the cooler. Your water temp is good and you have tried different oils so I doubt it a heat/viscosity problem. Sounds like a oil pump or worn engine issue. I would change the oil pump and run super high quality oil with a lot of Zinc and thrash the thing to death.